1. Ahlberg, J., Forchheimer, R.: Face tracking for model-based coding and face animation. Int. J. Imaging Syst. Technol. 13(1), 8–22 (2003)
2. Baker, S., Kanade, T.: Limits on super-resolution and how to break them. IEEE Trans. Pattern Anal. Mach. Intell. 24(9), 1167–1183 (2002)
3. Bartlett, M., Hager, J., Ekman, P., Sejnowski, T.: Measuring facial expressions by computer image analysis. Psychophysiology 36, 253–264 (1999)
4. Bartlett, M., Braathen, B., Littlewort-Ford, G., Hershey, J., Fasel, I., Marks, T., Smith, E., Sejnowski, T., Movellan, J.R.: Automatic analysis of spontaneous facial behavior: A final project report. Technical Report INC-MPLab-TR-2001.08, Machine Perception Lab, Institute for Neural Computation, University of California, San Diego (2001)
5. Bartlett, M., Littlewort, G., Frank, M., Lainscsek, C., Fasel, I., Movellan, J.: Automatic recognition of facial actions in spontaneous expressions. J. Multimed. 1(6), 22–35 (2006)